Hollow projectile-shell of sheet metal



T. E. MURRAY, 111., AND .I. 'B. MURRAY.

HOLLOW PROJECTILE SHELL 0F SHEET METAL.

APPL ICATION FILED JULY 15. 1918.

Patented Aug. 24, 1920.

UNITED STATES PATENT OFFICE.

THOMAS E. MURRAY, JR, AND JOSEPH B. MURRAY, OF BROOKLYN,.NEW YORK.

HOLLOW PROJECTILE-SHELL 0F SHEET METAL.

Specification of Letters Patent. Patented Aug. 24, 1920.

Application filed July 15, 1918. Serial No. 244,935.

To all whom it may concern:

Be it known that we, THOMAS E. MURRAY, Jr., and JOSEPH B. MURRAY, citizens of the United States, residing at Brooklyn, in the county of Kings and State of New York,

have invented a certain new and useful Improvement in Hollow Projectile-Shells of Sheet .Metal, of which the following is a specification.

The invention is an elon ated hollow projectile shell formed integrally of sheet metal, and a process of making the same, whereby we are enabled to produce such shells with great rapidity, in very large quantities and at a greatly reduced cost as compared with that of shells as at present made. As a matter of record of actual performance, we are than one minute, inclu 'ng the time of handling and transportation to the dies and weldin machine. The finished shell is everyw ere integral, and is, as abundant Government tests have shown, everywhere uniformly strong. 1

In the accompanying drawin Figure 1 shows the blank of sheet metal from which a section of the shell is produced. Fig. 2 shows the section cut from said blank, the final configuration of the finished section being here developed in a plane. F ig. v3 shows said section after pressing in .dies to give it the shape of a longitudinally divided half of the projectile. Fig. 4 shows said section] after swaging to true its shape. F ig.,5 shows two of saidvsections disposed in the welding electrodes.

Similar letters of reference indicate like pasts. l

In carrying out our-process, we proceed as follows:-

From a sheet of thin metal, Fig. 1, of suitable area we produce, by stamping, a blank, Fig. 2, which shows a configuration obtained by developing in a plane the conformation of one of the two interchangeable longitudinal sections which togther make up the projectile shell. This blank is then placed etween suitable dies and caused by pressure to assume the concave form shown in Fig. 3. If this first sha ing should leave the longitudinal edges of the section somewhat irregular and the curvature of the section not accurately true, we subject the section to a second pressing or swaging in suitable dies, whereby the shape is trued and the longitudinal edges A rendered flat and smooth, as shown in Fig. 4.

We thus produce any desired number of similar and interchangeable sections, two of whlch, B, B, Fig. 5-, are seated in correspondingly recessed electrodes C, D, the edges of said sections being in registering contact, and -we press said edges together while establishing the welding current. We

preferably employ a current of very great strength-from 5000 to 30,000 amperes per square inch-and for a very brief period of time, by which means we unite the two sections integrally, so that substantially no gfiint appears, thus completing the projectile ell. 1

We claim:

As a new article of manufacture and sale, an elongated hollow projectile shell of sheet metal formed integrally of twointerchangeable longitudinally divided sections electrically united at their registering edges.

In testimony whereof We have aflixed our signatures in presence of two witnesses.

THdMAs E. MURRAY, JR. JOSEPH B. MURRAY.

Witnesses:

GERTRUDE T. PORTER, ,MAY T. MCGARRY.,- 

